Difference between revisions of "Lesson 7--Microduino “RGB LED”"

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{{Language|第七课--控制_RGB_彩色_LED_灯的颜色/zh}}
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{{Language|第七课--控制_RGB_彩色_LED_灯的颜色}}
 
{| style="width: 800px;"
 
{| style="width: 800px;"
 
|-
 
|-
 
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==Objective==
 
==Objective==
−
You have learned several LED experiment, then go on studying the RGB LED that is display different color by a RGB LED, including the breathing lamp's effect.
+
By now you are familiar with using an LED. Let's take a look at the RGB LED. This new type of LED allows us to display different colors. We can also replicate the breathing light effect from last lesson.
 
==Equipment==
 
==Equipment==
 
*'''[[Microduino-Core]]'''
 
*'''[[Microduino-Core]]'''
 
*'''[[Microduino-FT232R]]'''
 
*'''[[Microduino-FT232R]]'''
 
*Other hardware equipment
 
*Other hardware equipment
−
**Breadboard Jumper            one box 
+
**1x Box of breadboard jumper wires           
−
**Breadboard               one piece 
+
**1x Breadboard              
−
**RGB LED                     one
+
**1x RGB LED                
−
**220Ω resistor           one
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**1x 220Ω resistor  
−
**USB Data cable               one
+
**1x USB Data cable        
 +
 
 +
[[File:lesson7All.jpg|600px|center|thumb]]
  
 
===RGB===
 
===RGB===
−
RGB LED contains three LEDs, one is red, the other is green and another it blue.  
+
RGB LED contains three LEDs: red, green, and blue.  
−
By controlling three LED's brightness, you can mix up almost any color you want.
+
By controlling the three LED's brightness, you can create any color you want.
 
[[File:lesson7-RGB.jpg|600px|center|thumb]]
 
[[File:lesson7-RGB.jpg|600px|center|thumb]]
  
−
===Connection method===
+
===Connection Methods===
−
*Method 1: The longest lead wire (anode) will be connected to +5 V. The other three pins are connected the series resistance of 220Ω then connected to Microduino PWM output port. The resistance use to prevent too much current flows and burn the LED.
+
*Method 1: Connect the longest lead wire (anode) to +5V. The other three pins are connected to  a 220Ω resistor and then connected to a Microduino PWM output port. We attach resistors to prevent too much current flow from damaging the LEDs.
−
*Method 2: RGB anode through 220Ω resistor connect to Vcc, the other three pins connected to the PWM output port. Three LED share a resistance, then the brightness dimmed.
 
  
−
==Experimental schematic==
+
*Method 2: Connect the anode through a 220Ω resistor to +5V. The other three pins are connected to PWM output ports. Since three LEDs share a single resistor, the brightness will be dimmer.
 +
 
 +
==Experiment Schematic==
 
The following connection uses method 1 and uses D5,D6,D11.
 
The following connection uses method 1 and uses D5,D6,D11.
 
[[File:lesson7-schematic.jpg|600px|center|thumb]]
 
[[File:lesson7-schematic.jpg|600px|center|thumb]]
Line 30: Line 33:
 
==Program==
 
==Program==
 
<source lang="cpp">
 
<source lang="cpp">
−
　　　int redPin = 11;
+
int redPin = 11;
−
　　　int greenPin = 5;
+
int greenPin = 5;
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　　　int bluePin = 6;
+
int bluePin = 6;
−
　　　void setup()
+
void setup()
−
　　　{
+
{
−
　　　  pinMode(redPin, OUTPUT);
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  pinMode(redPin, OUTPUT);
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　　　  pinMode(greenPin, OUTPUT);
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  pinMode(greenPin, OUTPUT);
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　　　  pinMode(bluePin, OUTPUT);   
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  pinMode(bluePin, OUTPUT);   
−
　　　}
+
}
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　　　void loop()
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void loop()
−
　　　{
+
{
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　　　  setColor(255, 0, 0);  // Red
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    setColor(255, 0, 0);  // Red
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　　　  delay(1000);
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    delay(1000);
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　　　  setColor(0, 255, 0);  // Green
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    setColor(0, 255, 0);  // Green
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　　　  delay(1000);
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    delay(1000);
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　　　  setColor(0, 0, 255);  // Blue
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    setColor(0, 0, 255);  // Blue
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　　　  delay(1000);
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    delay(1000);
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　　　  setColor(255, 255, 0);  // Yellow
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    setColor(255, 255, 0);  // Yellow
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　　　  delay(1000);   
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    delay(1000);   
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　　　  setColor(80, 0, 80);  // Purple
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    setColor(80, 0, 80);  // Purple
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　　　  delay(1000);
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    delay(1000);
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　　　  setColor(255, 255, 255);// White  
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    setColor(255, 255, 255);// White  
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　　　  delay(1000);
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    delay(1000);
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　　　  setColor(0, 0, 0);  //Black
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    setColor(0, 0, 0);  //Black
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　　　  delay(1000);
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    delay(1000);
−
　　　  for(int i=0;i<255;i+=5)//Red coming on
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    for(int i=0;i<255;i+=5)//Red coming on
−
　　　  {
+
    {
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　　　    setColor(i, 0, 0);   
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        setColor(i, 0, 0);   
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　　　    delay(30);
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        delay(30);
−
　　　  }
+
    }
−
　　　  delay(100);
+
    delay(100);
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　　　  for(int i=255;i>0;i-=5)//Red coming off
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    for(int i=255;i>0;i-=5)//Red coming off
−
　　　  {
+
    {
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　　　    setColor(i, 0, 0);   
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        setColor(i, 0, 0);   
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　　　    delay(30);
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        delay(30);
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　　　  }
+
    }
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　　　  delay(100);
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    delay(100);
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　　　  for(int i=0;i<255;i+=5)//Blue coming on
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    for(int i=0;i<255;i+=5)//Blue coming on
−
　　　  {
+
  {
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　　　    setColor(0, i, 0);  
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        setColor(0, i, 0);  
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　　　    delay(30);  
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        delay(30);  
−
　　　  }
+
    }
−
　　　  delay(100);
+
    delay(100);
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　　　  for(int i=255;i>0;i-=5)//Blue coming off
+
    for(int i=255;i>0;i-=5)//Blue coming off
−
　　　  {
+
    {
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　　　    setColor(0, i, 0);   
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        setColor(0, i, 0);   
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　　　    delay(30);
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        delay(30);
−
　　　  }
+
    }
−
　　　  delay(100);
+
    delay(100);
−
　　　  for(int i=0;i<255;i+=5)//Green coming on
+
    for(int i=0;i<255;i+=5)//Green coming on
−
　　　  {
+
    {
−
　　　    setColor(0, 0, i);   
+
        setColor(0, 0, i);   
−
　　　    delay(30);   
+
        delay(30);   
−
　　　  }
+
    }
−
　　　  delay(100);
+
    delay(100);
−
　　　  for(int i=255;i>0;i-=5)//Green coming off
+
    for(int i=255;i>0;i-=5)//Green coming off
−
　　　  {
+
    {
−
　　　    setColor(0, 0, i);   
+
        setColor(0, 0, i);   
−
　　　    delay(30);
+
        delay(30);
−
　　　  }
+
    }
−
　　　  delay(100);
+
    delay(100);
−
　　　}
+
}
−
　　　void setColor(int red, int green, int blue)//Color display program
+
void setColor(int red, int green, int blue)//Color display program
−
　　　{
+
{
−
　　　  analogWrite(redPin, 255-red); //A total of anode RGB, low level light red LED
+
    analogWrite(redPin, 255 - red);  
−
　　　  analogWrite(greenPin, 255-green);
+
    analogWrite(greenPin, 255 - green);
−
　　　  analogWrite(bluePin, 255-blue);   
+
    analogWrite(bluePin, 255 - blue);   
−
　　　}
+
}
 
</source>
 
</source>
−
Program custom setColor function and invoked in loop directly which make the program looks clean and clear.
+
We wrote a setColor() function so that it can be invoked in loop() directly. This makes the program look cleaner and clearer.
  
−
Here just list a few kinds of color, you can get color value through other colors modulus software, such as PhotoShop.
+
The above program only lists a few colors you can make. You can search online for RGB values for any color you want.
  
 
==Result==
 
==Result==
−
In a light can be seen on red, green, blue, yellow, purple, black, white, and effect like a breathing lamp .
+
The light will go from red, green, blue, yellow, purple, black, and to white. Then, it will behave like a breathing light as in Lesson 6.
 +
 
 +
[[File:lesson7Result.jpg|600px|center|thumb]]
  
 
==Video==
 
==Video==
 +
http://v.youku.com/v_show/id_XNzEwMDA0Njg0.html
 
|}
 
|}

Latest revision as of 00:07, 15 July 2015

Language: English  • 中文

Objective

By now you are familiar with using an LED. Let's take a look at the RGB LED. This new type of LED allows us to display different colors. We can also replicate the breathing light effect from last lesson.

Equipment

Lesson7All.jpg

RGB

RGB LED contains three LEDs: red, green, and blue. By controlling the three LED's brightness, you can create any color you want.

Lesson7-RGB.jpg

Connection Methods

  • Method 1: Connect the longest lead wire (anode) to +5V. The other three pins are connected to a 220Ω resistor and then connected to a Microduino PWM output port. We attach resistors to prevent too much current flow from damaging the LEDs.
  • Method 2: Connect the anode through a 220Ω resistor to +5V. The other three pins are connected to PWM output ports. Since three LEDs share a single resistor, the brightness will be dimmer.

Experiment Schematic

The following connection uses method 1 and uses D5,D6,D11.

Lesson7-schematic.jpg

Program

int redPin = 11;
int greenPin = 5;
int bluePin = 6;
void setup()
{
  pinMode(redPin, OUTPUT);
  pinMode(greenPin, OUTPUT);
  pinMode(bluePin, OUTPUT);  
}
void loop()
{
     setColor(255, 0, 0);  // Red
     delay(1000);
     setColor(0, 255, 0);  // Green
     delay(1000);
     setColor(0, 0, 255);  // Blue
     delay(1000);
     setColor(255, 255, 0);  // Yellow
     delay(1000);  
     setColor(80, 0, 80);  // Purple
     delay(1000);
     setColor(255, 255, 255);// White 
     delay(1000);
     setColor(0, 0, 0);  //Black
     delay(1000);
     for(int i=0;i<255;i+=5)//Red coming on
     {
        setColor(i, 0, 0);  
        delay(30);
     }
     delay(100);
     for(int i=255;i>0;i-=5)//Red coming off
     {
        setColor(i, 0, 0);  
        delay(30);
     }
     delay(100);
     for(int i=0;i<255;i+=5)//Blue coming on
   {
        setColor(0, i, 0); 
        delay(30); 
     }
     delay(100);
     for(int i=255;i>0;i-=5)//Blue coming off
     {
        setColor(0, i, 0);  
        delay(30);
     }
     delay(100);
     for(int i=0;i<255;i+=5)//Green coming on
     {
        setColor(0, 0, i);  
        delay(30);  
     }
     delay(100);
     for(int i=255;i>0;i-=5)//Green coming off
     {
        setColor(0, 0, i);  
        delay(30);
     }
     delay(100);
}
void setColor(int red, int green, int blue)//Color display program
{
     analogWrite(redPin, 255 - red); 
     analogWrite(greenPin, 255 - green);
     analogWrite(bluePin, 255 - blue);  
}

We wrote a setColor() function so that it can be invoked in loop() directly. This makes the program look cleaner and clearer.

The above program only lists a few colors you can make. You can search online for RGB values for any color you want.

Result

The light will go from red, green, blue, yellow, purple, black, and to white. Then, it will behave like a breathing light as in Lesson 6.

Lesson7Result.jpg

Video

http://v.youku.com/v_show/id_XNzEwMDA0Njg0.html

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